Telegraph instrument



Patented Mar. 27, 1923.

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rnnneraarn Application filed August 1921.

T0 (ZZZ whom it may concern:

Be it known that I, Osoan Doiuus, a citizen of the United States, residing: at Harney in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Telegraph Instruments, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to sounders for telegraph circuits and relates particularly to a combination sounder and relay in which the principal object is to provide means whereby the local battery employed in connection with such devices may be dispensed with and the instrument operated directly by the current from the main circuit, together with simple means whereby such instrument may be readily and accurately adjusted during times of abnormal atmospheric disturbzmces such as occur during varied weather conditions.

Other objects and advantages of the invention Will appear in the further description thereof.

The accompanying drawing forming; part of this application illustrates a wiring: dia gram and conventional showing of the instruments readily understood by those versed in the art. I

In carrying out my invention the standard sounder 1 and relay instrument 2 are used,

except that each magnet of the sounder is wound to 250 ohms, which, if connected. in series as is common would result in 500 ohms, but I prefer to connect the magnets in multiple as at 3, thereby reducing the total resistance to 125 ohms.

The magnets of the sounder 1 are connected with the relay magnets in series, as illustratedin the accompanying diagram, and the relay magnets are connected together in series. as is usual.

In the relay 2. l have reversed the posh tion of the platinum and insulated points as compared to that commonly practicerh so that when the circuit to the relay coils broken, the contact fingers 5 intermediate of said points is immediately drawn. by the mechanical action of the adjusting spring 10 to contact with the platinum point 6, thus forming a short circuit between the sounder and the relay ready for initial action at a subsequent closing of the main line circuit: said short circuit being accomplished by the INSTRUMENT.

Isa-1&1 no. 488,774.

insulated points. j i i l A suitably manually operatedadjusting screw 9 1s CGOPGI'ZtlZlVGlY. associatedwiththe spring 10 so that the tension 'of the latter may be regulated to govern the duration of action through said short circuit, it being understood that at the initial operation of the instrument (the main line having been opened) the main circuit will be closed to the relay only, but for an instant due to the action of the spring 10 holding the finger 5 against the platinum point, but when the finger 5 responds to the magnetic action of the relay the contact between the finger "5 and the platinum point will be broken, thus augmenting the circuit through the sounder and relay simultaneously. In the event of a-dash being formed by an operator the circuit through both the sounder and relay remains closed, but if a dot is formed the finger 5 instantly returns by the action of the spring 10 to its circuit closed position and the action of the fingerbeing mechanically adjustable by the screw 9 as before described results in the relay being employed as a governor as is obvious during electric fluctuations. This results in preventing the sounder from operating during the transient period, and energizing the sounder when the current in the main line has reached its maximum value to get a more positive sound.

In this improved formof initially shunting the circuit intermediate of the relay and sounder and having the adjustment associated therewith, it has been. found by experience that when the instrument is adjusted to care for an abnormal circuit condition clue to weather disturbances it will continue to operate properly irrespective of distance from the stationso adjusted whether sending or receiving.

From the foregoing it is evident that I have devised. an exceedingly simple means for eliminating theuse of local station batteries and whereby it is possible to operate all of the instruments on a single line by the main line current.

Having thus described my invention. what I claim and desire to secure by Letters Patent, is:-

1. The combination with a telegraph instrument of the class described comprising a sounder and a relay operated by the main bypass 8 intermediate of the platinum and I line circuit, of means whereby the actuating circuit to the sounder is initially short cir cuited through the-relay, and means for adjusting the actuating circuit. 7

2. A telegraph instrument of the character described comprising in combination a sounder, the magnets of which are connected in multiple, a relay, the magnets of which are connectedyin series, a series circuit connecting the sounder and relay, and

' a main line circuit to which the relay isconnected, and a shunting circuit intermediate of the sounder and relay, substantially as and for the purpose described;

3. A telegraph instrument of the character described comprising in combination a sounder, the magnets of which are connected in multiple, a relay, the magnets of which are connected in series, a series circuit connecting the sounder and relay, :1 main line circuit to which the relay is connected, and an alternate magnetic and me- OSCAR R. DORBIS.

Witnesses: v

S. C. BRONSON, S. GEO. STEVENS. 

